（）is the tools to be used to make deal between the seller and buyer by Extranet in a paperless circumstance．

A．POS

B．Electronic commerce

C．EDI

D．Electronic order system

胎膜早破是指（）

A.在妊娠晚期胎膜破裂

B.在临产前胎膜破裂

C.在妊娠期胎膜破裂

D.在分娩时胎膜破裂

E.在妊娠晚期和临产前胎膜破裂